Suprastic said:I wont be hard. Both cars have a double DIN slot, but the wiring harness will be different. Easy fist though. If you can get the male connector off a MK4 then you can spice it to your factory harness on the MK3. You'll also have to find out what speaker wires on the MK4 since it'll have 6 or more speakers. Even then, you might only be able to get 4 speakers instead of 6 unless you have a 6+ (89+ cars) speaker system. Not hard.
suprastanger507mgte said:If you buy one of those Scosche wiring and it shold not be any problem. The har ness is almost the same.